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Home › 00. QUANTUM INFORMATION SCIENCE › 01. PHYSICS AND INFORMATION SCIENCE

01.30.+r Quantum states and dynamics as a resource for information processing

Quantitative simulation of a magneto-optical trap operating near the photon recoil limit

Fri, 2018-02-02 17:09 - Ryan Hanley
Date: 
2017-06-21 - 2017-11-22
Author(s): 

Ryan K. Hanley, Paul Huillery, Niamh C. Keegan, Alistair D. Bounds, Danielle Boddy, Riccardo Faoro & Matthew P. A. Jones

Reference: 

10.1080/09500340.2017.1401679

URL: 

10.1080/09500340.2017.1401679

We present a quantitative model for magneto-optical traps operating on narrow transitions, where the transition linewidth and the recoil shift are comparable. We combine a quantum treatment of the light scattering process with a Monte-Carlo simulation of the atomic motion.

  • H2020
  • RySQ
  • FP7
  • 01.30.+r Quantum states and dynamics as a resource for information processing
  • 15.10.En Atomic ensembles
  • Result
  • 15.10.Ne Neutral atoms: electronic states
  • Read more

Quantum theory of Kerr nonlinearity with Rydberg slow light polaritons

Thu, 2017-05-11 11:48 - Hans Peter Büchler
Date: 
2017-05-11
Author(s): 

Przemyslaw Bienias, and Hans Peter Büchler

Reference: 

New J. Phys. 18, 123026 (2016)

URL: 

http://iopscience.iop.org/article/10.1088/1367-2630/aa50c3/meta;jsession...

  • RySQ
  • 01.30.+r Quantum states and dynamics as a resource for information processing
  • Result

Contactless nonlinear optics mediated by long-range Rydberg interactions

Wed, 2017-05-03 11:46 - Ryan Hanley
Date: 
2016-12-19
Author(s): 

Hannes Busche, Paul Huillery, Simon W. Ball, Teodora Ilieva, Matthew P. A. Jones & Charles S. Adams

Reference: 

Nature Physics (2017), doi:10.1038/nphys4058

URL: 

http://www.nature.com/nphys/journal/vaop/ncurrent/full/nphys4058.html

In conventional nonlinear optics, linear quantum optics

  • H2020
  • RySQ
  • 01.30.+r Quantum states and dynamics as a resource for information processing
  • 15.10.En Atomic ensembles
  • Result
  • 15.10.Ry Rydberg atoms
  • Read more

Interference and dynamics of light from a distance-controlled atom pair in an optical cavity

Tue, 2016-05-31 14:29 - Stephan Ritter
Date: 
2016-02-29
Author(s): 

Andreas Neuzner, Matthias Körber, Olivier Morin, Stephan Ritter, Gerhard Rempe

Reference: 

Nature Photonics 10, 303 (2016)

URL: 

http://dx.doi.org/10.1038/nphoton.2016.19

Interference is central to quantum physics and occurs when indistinguishable paths exist, as in a double-slit experiment. Replacing the two slits with single atoms introduces optical nonlinearities for which non-trivial interference phenomena are predicted. Their observation, however, has been hampered by difficulties in preparing the required atomic distribution, controlling the optical phases and detecting the faint light.

  • 33.10.+a Cavity QED (atoms or ions)
  • QIPC
  • 01.30.+r Quantum states and dynamics as a resource for information processing
  • SIQS
  • 15. IMPLEMENTATIONS: QUANTUM OPTICS
  • 15.20.Ca Cavity QED
  • 15.20.Ol Optical lattices
  • Read more

A local shortcut to adiabaticity for quantum many-body systems

Tue, 2016-05-31 00:04 - Davide Rossini
Date: 
2016-03-16
Author(s): 

Victor Mukherjee, Simone Montangero, and Rosario Fazio

Reference: 

arXiv:1603.05057

URL: 

http://arxiv.org/abs/1603.05057

We study the environment assisted local transitionless dynamics in closed spin systems driven through quantum critical points. In general shortcut to adaiabaticity (STA) in quantum critical systems requires highly non-local control Hamiltonians. In this work we develop an approach to achieve local shortcuts to adiabaticity (LSTA) in spin chains, using local control fields which scale polynomially with the system size, following universal critical exponents.

  • 12.10.+i Simulations of many-body interactions
  • 01.30.+r Quantum states and dynamics as a resource for information processing
  • SIQS
  • Read more

Shortcut to Adiabaticity in the Lipkin-Meshkov-Glick Model

Mon, 2016-05-30 22:40 - Davide Rossini
Date: 
2015-05-01
Author(s): 

Steve Campbell, Gabriele De Chiara, Mauro Paternostro, G. Massimo Palma, and Rosario Fazio

Reference: 

Phys. Rev. Lett. 114, 177206 (2015)

URL: 

http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.177206

We study transitionless quantum driving in an infinite-range many-body system described by the Lipkin-Meshkov-Glick model. Despite the correlation length being always infinite the closing of the gap at the critical point makes the driving Hamiltonian of increasing complexity also in this case. To this aim we develop a hybrid strategy combining a shortcut to adiabaticity and optimal control that allows us to achieve remarkably good performance in suppressing the defect production across the phase transition.

  • QIPC
  • 01.30.+r Quantum states and dynamics as a resource for information processing
  • SIQS
  • 05.70.+o Quantum information & quantum control

Nonlinear quantum optics mediated by Rydberg interactions

Fri, 2016-03-18 15:55 - Ryan Hanley
Date: 
2016-02-19
Author(s): 

Ofer Firstenberg, Charles S. Adams, Sebastian Hofferberth

Reference: 

arXiv:1602.06117v1

URL: 

arXiv:1602.06117v1

By mapping the strong interaction between Rydberg excitations in ultra-cold atomic ensembles onto single photons via electromagnetically induced transparency it is now possible to realize a nonlinear optical medium which can modify light on the level of individual photons.

  • H2020
  • QIPC
  • RySQ
  • 01.30.+r Quantum states and dynamics as a resource for information processing
  • Highlight
  • Result
  • 15.10.Ry Rydberg atoms
  • 15.10.Ph Photons
  • 15.20.–e Quantum Optics: Experimental system
  • Read more

Precise qubit control beyond the rotating wave approximation

Fri, 2016-03-04 10:26 - Werner Weiss
Date: 
2014-09-19
Author(s): 

J. Scheuer, Xi Kong, R. S. Said, J. Chen, A. Kurz, L. Marseglia, J. Du, P. R. Hemmer, S. Montangero, T. Calarco, B. Naydenov, F. Jelezko

Reference: 

New J. Phys. 16, 093022 (2014)
http://dx.doi.org/10.1088/1367-2630/16/9/093022

URL: 

http://iopscience.iop.org/article/10.1088/1367-2630/16/9/093022

  • 41. METROLOGY
  • H2020
  • QIPC
  • 01.30.+r Quantum states and dynamics as a resource for information processing
  • Result
  • SIQS
  • 16.10.Ns Nuclear spins
  • 05.70.+o Quantum information & quantum control
  • STREPs
  • 16.20.Dc Defect centers in diamonds
  • Other
  • Read more

Optimizing for an arbitrary perfect entangler. I. Functionals

Thu, 2016-03-03 16:28 - Werner Weiss
Date: 
2015-06-08
Author(s): 

P. Watts, J. Vala, M. M. Müller, T. Calarco, K. Birgitta Whaley, D. M. Reich, M. H. Goerz, C. P. Koch

Reference: 

Phys. Rev. A 91, 062306 (2015)
http://dx.doi.org/10.1103/PhysRevA.91.062306

URL: 

http://journals.aps.org/pra/abstract/10.1103/PhysRevA.91.062306

Optimal control theory is a powerful tool for improving figures of merit in quantum information tasks. Finding the solution to any optimal control problem via numerical optimization depends crucially on the choice of the optimization functional. Here, we derive a functional that targets the full set of two-qubit perfect entanglers, gates capable of creating a maximally entangled state out of some initial product state. The functional depends on easily computable local invariants and unequivocally determines whether a gate is a perfect entangler.

  • 01.10.+i Encoding, processing and transmission of information via physical systems
  • H2020
  • QIPC
  • RySQ
  • 01.30.+r Quantum states and dynamics as a resource for information processing
  • 03. ENTANGLEMENT
  • Result
  • SIQS
  • Read more

Phonon-to-spin mapping in a system of a trapped ion via optimal control

Thu, 2016-03-03 16:05 - Werner Weiss
Date: 
2015-11-23
Author(s): 

M. M. Müller, U.G. Poschinger, T. Calarco, S. Montangero, F. Schmidt-Kaler

Reference: 

Phys. Rev. A 92, 053423 (2015)
http://dx.doi.org/10.1103/PhysRevA.92.053423

URL: 

http://journals.aps.org/pra/abstract/10.1103/PhysRevA.92.053423

We propose a protocol for measurement of the phonon number distribution of a harmonic oscillator based on selective mapping to a discrete spin-1/2 degree of freedom. We consider a system of a harmonically trapped ion, where a transition between two long-lived states can be driven with resolved motional sidebands. The required unitary transforms are generated by amplitude-modulated polychromatic radiation fields, where the time-domain ramps are obtained from numerical optimization by application of the chopped random basis algorithm (CRAB).

  • 01.10.+i Encoding, processing and transmission of information via physical systems
  • H2020
  • QIPC
  • 01.30.+r Quantum states and dynamics as a resource for information processing
  • Result
  • SIQS
  • 15.10.Iv Ions: vibrational states
  • 15.20.Lp Linear Paul traps
  • Read more
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